The deadly tropical storm could also bring issues for fliers during the holiday weekend and continue to bring higher gas prices throughout parts of the country.

Harvey hit Texas as a hurricane Aug. 25 and destroyed tens of thousands of homes while also disrupting airlines and causing prices at gas pumps to jump.

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The motorist group AAA said Thursday that the average national gas price has seen a jump to $2.37 while prices have shot up across the country.

Gas prices have already been particularly higher in states like Florida, Georgia, Illinois, Indiana, Michigan, Ohio, South Carolina and Washington. Consumers have alleged price-gouging in Texas. But gas prices could continue to rise, especially in areas like the Rockies, AAA says.

The Environmental Protection Agency has issued fuel waivers for 38 states and Washington, allowing fuel additive requirements to be temporarily suspended to help alleviate demand on supplies.

The U.S. air travel system is heading into the holiday weekend with one arm tied behind its back, with a surge of Labor Day travelers taking to the skies while Houston's busy airports remain hobbled from Hurricane Harvey.

About 16.1 million people are expected to fly during a seven-day period from Aug. 30 to Sept. 5 on U.S. airlines, the heart of the Labor Day travel period, according to Airlines for America. That's about 700,000 more than in 2016. And Friday is expected to be the busiest of those days.

Harvey has thrown a wrench into the operations of many of the largest U.S. airlines. It's one of the biggest disruptions to U.S. air travel since the terror attacks of Sept. 11, 2001.

Airlines have one message for fliers: If your itinerary includes Houston, as a destination or transfer, make sure to check the status of the flight before you leave for the airport. Operations for most airlines into Houston-area airports are still in flux and will be for a while.

"Things are changing almost by the minute," said Charles Hobart, a spokesman for United Airlines.